{"product_id":"blackbutt-timber-decking","title":"Blackbutt Decking","description":"\u003cp\u003eBlackbutt decking in 86 × 19 mm and 135 × 19 mm: a pale, golden Australian hardwood with Class 1 durability above ground, Janka hardness 8.9 kN and a place on the AS 3959 bushfire-resisting timber list, so it can be used for decking up to BAL-29.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSizes:\u003c\/strong\u003e 86 × 19 mm and 135 × 19 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTimber:\u003c\/strong\u003e Australian Blackbutt (\u003cem\u003eEucalyptus pilularis\u003c\/em\u003e), grown from Bega in NSW to Maryborough in Queensland; golden yellow to pale brown; about 900–930 kg\/m³\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Class 1 above ground, which the Queensland Government rates at more than 40 years’ expected life; Class 2 in-ground; the heartwood is termite resistant\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBushfire:\u003c\/strong\u003e on the AS 3959 list of bushfire-resisting timbers, so it can be used for decking up to BAL-29 (BAL-40 and Flame Zone need tested systems)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine Blackbutt:\u003c\/strong\u003e some suppliers sell other species under the name “Blackbutt”, which can differ in colour, durability and bushfire rating. Ours is Australian Blackbutt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJoist spacing:\u003c\/strong\u003e 450 mm centres, as WoodSolutions recommends for decking; its deck design guide allows up to 500 mm for 19 mm hardwood, or 350 mm if the boards run at 45°\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGaps:\u003c\/strong\u003e 3–4 mm between 86 mm boards and 4–5 mm between 135 mm boards at installation (WoodSolutions deck design guide)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHow much for a deck:\u003c\/strong\u003e a 20 m² deck needs about 140 lineal metres of 135 mm board or about 225 lineal metres of 86 mm, plus about 10% for offcuts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow decks:\u003c\/strong\u003e under 400 mm off the ground, WoodSolutions suggests 5–6 mm gaps and at least 40 mm between the deck and the house, for airflow\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixing:\u003c\/strong\u003e two fixings per board at every joist, at least 12 mm from edges and ends. Pre-drill this dense hardwood. Use stainless steel within 1 km of the coast or 1 m of a pool. See our \u003ca href=\"\/collections\/decking-accessories\"\u003edecking screws\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinishing:\u003c\/strong\u003e coat every face and cut end, ideally before fixing, then recoat at least once a year or as the oil maker directs (WoodSolutions); left bare, it weathers to silver-grey. Oils we stock: \u003ca href=\"\/products\/cutek-oil-extreme-cd50\"\u003eCUTEK CD50\u003c\/a\u003e, \u003ca href=\"\/products\/intergrain-universal-timber-oil\"\u003eIntergrain Universal Timber Oil\u003c\/a\u003e or \u003ca href=\"\/products\/sceneys-timber-decking-oil\"\u003eSceney’s Timber Decking Oil\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAt Greenhill:\u003c\/strong\u003e stocked at 170 Settlement Road, Thomastown, with pickup or delivery across Melbourne and regional Victoria. Compare species on our \u003ca href=\"\/collections\/timber-decking\"\u003ehardwood decking\u003c\/a\u003e page.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eBlackbutt decking: sizes, lengths and prices\u003c\/h2\u003e\n\u003ctable class=\"ght-sizes\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSize\u003c\/th\u003e\n\u003cth\u003eLengths\u003c\/th\u003e\n\u003cth\u003ePrice\u003c\/th\u003e\n\u003cth\u003eAvailability\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e135 × 19 mm\u003c\/td\u003e\n\u003ctd\u003eRandom length\u003c\/td\u003e\n\u003ctd\u003e$19.90 per lineal metre\u003c\/td\u003e\n\u003ctd\u003ein stock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e86 × 19 mm\u003c\/td\u003e\n\u003ctd\u003eRandom length\u003c\/td\u003e\n\u003ctd\u003e$10.36 per lineal metre\u003c\/td\u003e\n\u003ctd\u003ein stock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eBoth widths are sold in random lengths, usually 1.8–5.4 m, cut to suit. Prices are our website prices on 14 October 2026, per lineal metre; a 20 m² deck needs about 140 lineal metres of 135 mm board or 225 of 86 mm, plus 10% for cuts.\u003c\/p\u003e\n\u003ch2\u003eWhat Blackbutt decking is like\u003c\/h2\u003e\n\u003cp\u003eBlackbutt, \u003cem\u003eEucalyptus pilularis\u003c\/em\u003e, grows along the coast from Bega in NSW to Maryborough in Queensland and is the paler of the Australian decking hardwoods: golden yellow to pale brown, with a straight grain and, now and then, a slight pink cast. It is about 900 kg\/m³ seasoned, with a WoodSolutions seasoned hardness of 8.9 kN, heartwood that is naturally termite resistant, and sapwood that lyctid borer does not attack.\u003c\/p\u003e\n\u003cp\u003eIts durability is Class 1 above ground, which the Queensland Government tables put at more than 40 years, and Class 2 in the ground. Be aware that some yards sell other species under the name \"Blackbutt\"; ours is Australian \u003cem\u003eE. pilularis\u003c\/em\u003e, which is what the bushfire listing applies to.\u003c\/p\u003e\n\u003ch2\u003eWhere it suits\u003c\/h2\u003e\n\u003cp\u003eBlackbutt is on the AS 3959 list of bushfire-resisting timbers, so 19 mm boards can be used for decking up to BAL-29. The pale colour is the reason most people choose it: it stays cooler underfoot than the dark timbers and suits modern houses with pale render or light cladding. It bleeds more tannin than Spotted Gum in its first months, so hose it down before oiling and keep it off unsealed pale paving until it settles.\u003c\/p\u003e\n\u003ch2\u003eFixing and finishing\u003c\/h2\u003e\n\u003cp\u003ePre-drill, two screws per board per joist, 450 mm joist centres, 3–4 mm gaps on 86 mm boards and 4–5 mm on 135 mm. Coat every face and end before laying. Blackbutt takes a clear oil well and keeps its light colour better under a UV-filtered product such as \u003ca href=\"\/products\/cutek-oil-extreme-cd50\"\u003eCUTEK Extreme CD50\u003c\/a\u003e; \u003ca href=\"\/products\/intergrain-universal-timber-oil\"\u003eIntergrain Universal Timber Oil\u003c\/a\u003e is the budget option. Screws and joist tape are in \u003ca href=\"\/collections\/decking-accessories\"\u003edecking accessories\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eThe same timber for other jobs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/collections\/blackbutt-flooring\"\u003eBlackbutt flooring\u003c\/a\u003e – solid, engineered, hybrid and laminate floors\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/blackbutt-timber-flooring\"\u003eBlackbutt solid floorboards\u003c\/a\u003e – 83 × 14, 130 × 14 and 130 × 19 mm, Select and Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/blackbutt-engineered-flooring\"\u003eBlackbutt engineered flooring\u003c\/a\u003e – for slabs and underfloor heating\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/blackbutt-timber-cladding\"\u003eBlackbutt cladding\u003c\/a\u003e – the same timber on the wall\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/collections\/timber-decking\"\u003eHardwood decking\u003c\/a\u003e – all six species side by side\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompare the species\u003c\/h2\u003e\n\u003cp\u003eOur \u003ca href=\"\/blogs\/guides\/decking-timber-comparison-melbourne\"\u003edecking timber comparison\u003c\/a\u003e puts hardness, durability, bushfire rating and price per metre for all six hardwoods on one page; \u003ca href=\"\/collections\/merbau\"\u003eMerbau decking\u003c\/a\u003e is the budget alternative.\u003c\/p\u003e\n\u003ch2\u003eQuestions we get asked\u003c\/h2\u003e\n\u003ch3\u003eHow much does Blackbutt decking cost?\u003c\/h3\u003e\n\u003cp\u003eOn our website on 14 October 2026, 86 × 19 mm is $10.36 per lineal metre and 135 × 19 mm $19.90 per lineal metre.\u003c\/p\u003e\n\u003ch3\u003eIs Blackbutt decking BAL-29 rated?\u003c\/h3\u003e\n\u003cp\u003eYes. Australian Blackbutt is on the AS 3959 bushfire-resisting timber list, so 19 mm decking can be used up to BAL-29.\u003c\/p\u003e\n\u003ch3\u003eBlackbutt or Spotted Gum?\u003c\/h3\u003e\n\u003cp\u003eBlackbutt is paler and cooler underfoot; Spotted Gum is harder (10.1 kN against 8.9), bleeds less and is cheaper per metre in the wide board here. Both are Class 1 above ground.\u003c\/p\u003e\n\u003ch3\u003eDoes Blackbutt bleed?\u003c\/h3\u003e\n\u003cp\u003eSome tannin in the first wet weeks. Wash the deck down before the first oil and keep run-off away from pale, unsealed surfaces until it stops.\u003c\/p\u003e\n\u003ch3\u003eWill it stay that pale colour?\u003c\/h3\u003e\n\u003cp\u003eUnder a UV-filtered oil, mostly; under a plain oil it goes a deeper honey; left bare it silvers.\u003c\/p\u003e\n\u003ch2\u003ePickup and delivery\u003c\/h2\u003e\n\u003cp\u003eStocked at 170 Settlement Road, Thomastown, Mon–Fri 7 am–4:30 pm and Sat 9 am–1 pm. We pack and load it for you, or deliver across Melbourne and regional Victoria; delivery is quoted with the order. Call (03) 9465 9875 with your sizes and we will work out the lineal metres and the price.\u003c\/p\u003e\n","brand":"Greenhill Timbers","offers":[{"title":"135 x 19mm","offer_id":68913643388962,"sku":"GHT-9960","price":19.9,"currency_code":"AUD","in_stock":true},{"title":"86 x 19mm","offer_id":68913643421730,"sku":"GHT-9959","price":10.36,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0917\/3981\/5970\/files\/blackbutt-135-19-img.jpg?v=1792367797","url":"https:\/\/greenhilltimbers.com.au\/products\/blackbutt-timber-decking","provider":"Greenhill Timbers","version":"1.0","type":"link"}